Technology
PEMF Explained for Beginners: A Plain-English Guide
PEMF explained for beginners: what pulsed electromagnetic fields are, how a device makes them, what Hz and strength mean, and what to ask before you buy.
PEMF stands for pulsed electromagnetic field. It is a magnetic field that switches on and off in quick pulses, made by a coil of wire inside a device. That is PEMF explained for beginners in two sentences, and the rest of this guide fills in the picture without the jargon.
You do not need a science degree to follow it. If you can picture a fridge magnet and a light switch, you have everything you need.
What does PEMF stand for?
Take the three words one at a time.
- Field. An invisible area of magnetic force, like the one around a fridge magnet or the Earth itself.
- Pulsed. The field switches on and off, over and over, instead of staying steady.
- Electromagnetic. The field is made by sending electric current through a coil.
A fridge magnet has a steady field. PEMF is different because it pulses. The "P" is the whole point.
How a PEMF device makes a pulsed field
Every PEMF device follows the same basic recipe.
- A coil of wire. Electric current runs through it, and a magnetic field forms around it.
- A switch. A small circuit turns the current on and off in quick bursts. Each burst makes the field rise and fall. That is one pulse.
- A rhythm. The circuit decides how fast the pulses come, the shape of each pulse and how strong it is.
Change any of those and you have a different device. That is why two PEMF products can feel and behave very differently.
Hz and strength: the two numbers you will see
PEMF products often list two things.
Hertz (Hz) counts pulses per second. A device that pulses ten times a second is at ten Hz. Some devices pulse slowly and others much faster.
Strength is how strong the field is. It is measured in gauss or tesla. Some fields are very gentle, and others are much stronger.
OlyLife lists the technologies in each device, but it does not publish a field-strength figure at this time. I would rather tell you that than make one up. The PEMF page has more on how to read these numbers.
Where PEMF shows up
PEMF is not new. People use it in a few different places.
- In clinics. Some prescription PEMF devices are used in fracture care. They are a different device class than home products.
- In research. Scientists have run many trials on PEMF, for joints, bones, sleep and more. The results are mixed. Some studies reported an effect and others did not.*
- At home. Home devices include mats, small wearables, loops and foot platforms, at very different prices.
The studies in our library are independent studies of PEMF in general. None of them tested an OlyLife device, so they cannot tell you what an OlyLife device will do. If you want to read them yourself, the research library labels each one by type and strength of evidence.
PEMF in OlyLife devices
OlyLife builds PEMF into most of its range. It says it combines PEMF with terahertz technology in devices like the Tera-P90. Here is the company's own description: "OlyLife describes the Tera-P90 as combining bio-electromagnetic energy operating at 1 MHz with terahertz energy in a 3–3000 µm band."
That is OlyLife's wording, not a lab result. The Tera-P90 is a foot device with 30-minute sessions, and the Tera-P90+ adds handhelds and a 20-minute session. Both are designed for relaxation and everyday wellbeing.
If the terahertz part is new to you, read what terahertz adds to PEMF.
Why two PEMF devices can feel so different
Imagine two lamps. Both use electricity and both give light, but one is a soft reading lamp and the other is a bright work light. PEMF devices are like that too.
They can differ in:
- How fast they pulse. Some pulse slowly and some far faster.
- How strong the field is. Some are gentle and others much stronger.
- What shape the coil takes. Mats, wearables, loops and foot platforms all place the field differently.
- What else is in the device. Some add warmth, light or other technologies.
That is why a study of one PEMF product tells you little about another. It is also why price alone is not the whole story when you compare devices.
A few honest cautions
PEMF is a general wellness idea here, not a medical one. OlyLife devices are not medical devices and are not meant for any medical condition.
Some people should ask a doctor first, including anyone with a heart condition, an implanted device or a pregnancy. The Safe use page has the full list, and our post on PEMF safe-use basics covers the main points in plain words.
Questions to ask about any PEMF device
- Does the maker publish the pulse rate and the strength?
- Is it sold as a wellness product or as a medical device, and does the maker say which?
- What does the maker say about who should not use it?
- Who is selling it, and is that seller authorized?
- What is the real cost per session once you own it?
A good seller will answer all five without fuss.
Your next step
Want the full explainer with pictures? Visit the PEMF explained page, or browse the technology hub. More guides like this are in the technology section of the blog.